package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;


    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断加入购物车的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在，数量加一
        if(list !=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在，插入一条购物车数据

            //判断本次添加的是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    public List<ShoppingCart> showShoppingCart() {

        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //创建出购物车实体
        ShoppingCart shoppingCart = new ShoppingCart();
        //拷贝数据
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //查看那个用户发的
        Long userId = BaseContext.getCurrentId();
        //插入userid
        shoppingCart.setUserId(userId);
        //查看购物车列表所有菜品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //因为购物车是只有一条数据,将那条数据找出来
        shoppingCart = list.get(0);
        //根据判断里面的number大小来决定是直接删除还是number-1
        Integer number = shoppingCart.getNumber();
        if(number>1){
            //大于1，number-1
            shoppingCart.setNumber(shoppingCart.getNumber() - 1);
            //更改数据库中的number
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else{
            //等于1,直接删除菜品,根据菜品id来删除
            shoppingCartMapper.deleteById(shoppingCart.getId());
        }


    }
}
